Akai HX-RS User manual

■
AKAi
I
STEREO CASSETTE DECK
I
MODEL HX-RS
MODELGX-R6

----
ABBREVIATIONS FOR SERVICE MANUAL
MODEL HX-R5/GX-R6
ABBREVIATIONS
EXPLANATION
AC Alternating Current
ADJ ADJust
ALU Arithmetic and Logic Unit
A-SW Analogue SWitch
BSS
Blank Search System
DET DETector
EQ EQualizer
EXT
EXTernal
FF Fast Forward
FLO FLuorescent Display
FREQ FREQuency
FWD ForWarD
GND GrouND
'"H'' High (referring to voltage)
HLS High Level Stage
INH INHibit
IPLS Instant Programme Locating System
LLS Low Level Stage
MIC
MI Crophone
NR
Noise Reduction
osc OSCillator
RL ReLay
REC RECord
REF REFerence
REV REVerse
REW REWind
RWD ReWinD
SEL SELect
SENS SENSitivity
XTAL
CrysTAL

STEREO CASSETTE DECK
MODEL HX-R5
STEREO CASSETTE DECK
MODEL GX-R6
SECTION 1 SERVICE MANUAL............................................... 3
SECTION 2 PARTS LIST............................................................ 35
SECTION 3 SCHEMATIC DIAGRAM ...................................... 53
-----------SERVICE MANUAL HX-R5/GX-R6-----------

SAFETY INSTRUCTIONS
SAFETY CHECK AFTER SERVICING
Confirm the specified insulation resistance between power cord plug prongs and externally exposed parts of the set is
greater than 10 Mohms, but for equipment with external antenna terminals (tuner, receiver, etc.) and is intended for [g
or [Al, specified insulation resistance should be more than 2.2 Mohms (ground terminals, microphone jacks, headphone
jacks, line-in outjacks etc.).
PRECAUTIONS DURING SERVICING
I. Parts identified by the Lt symbol parts are critical for safety.
Replace only with parts number specified.
2. In addition to safety, other parts and assemblies are specified for conformance with such regulations as those apply-
ing to spurious radiation. These must also be replaced only with specified replacements.
Examples: RF converters, tuner units, antenna selector switches,
RF cables, noise blocking capacitors, noise block-
ing filters, etc.
3. Use specified internal wiring. Note especially:
I) Wires covered with PVC tubing
2) Double insulated wires
3) High voltage leads
4. Use specified insulating materials for hazardous live parts. Note especially:
I) Insulation Tape
2) PVC tubing
3) Spacers (Insulating Barriers)
4) Insulation sheets for transistors
5) Plastic screws for fixing microswitch (especially in turntable)
5. When replacing AC primary side components (transformers, power cords, noise blocking capacitors, etc.), wrap
ends
of wires securely about the terminals before soldering.
6. Observe that wires do not contact heat producing parts (heatsinks, oxide metal film resistors, fusible resistors, etc.).
7. Check that replaced wires do not contact sharp edged or pointed parts.
8. Also check areas surrounding repaired locations.
9. Use care that foreign objects (screws, solder droplets, etc.) do not remain inside the set.
10. Voltage Conversion
l) Models for Japan, Canada, USA, Europe, UK and Australia are not equipped with this facility.
Each machine
is preset at the factory according to destination, but some machines can be set to l IOV, 120V,
220V
or 240V as required.
IfVoltage conversion on your machine is possible,
1-1) Disconnect power cord.
1-2) Turn the VOLTAGE SELECTOR located on the rear panel with a screwdriver until the correct voltage is
indicated.
2) Cycle Conversion
Cycle conversion
is not necessary since HX-R5 and GX-R6 uses DC motors.
---------------SERVICE MANUAL HX-R5/GX-R6---------------
2

SECTION 1
SERVICE MANUAL
TABLE OF CONTENTS
I. SPECIFICATIONS ........................................................................... 4
II. DISMANTLING OF UNIT ............................................................. 6
III. CONTROLS..................................................................................... 7
IV. PRINCIPAL PARTS LOCATION................................................... 8
V. CIRCUIT OPERATION DESCRIPTION....................................... 9
I. PRE-AMP BLOCK DIAGRAM................................................... 9
2. SYSCON BLOCK DIAGRAM AND THE PERIPHERAL
CIRCUIT.......................................................................................
10
3. ELECTRONIC VOLUME ............................................................ 11
VI. MECHANICAL DESCRIPTION OF EACH MODEL .................... 13
I. DESCRIPTION OF THE MECHANISM DRIVEN
BY CAM WHEELS (L) & (R) ........................................................ 13
VII. ME(HANICAL ADJUSTMENT.................................................... 18
I. PINCH ROLLER PRESSURE MEASUREMENTS ..................... 18
2. WINDING TORQUE MEASUREMENT IN EACH
MODE...........................................................................................
18
3. TAPE SPEED ADJUSTMENT .................................................... 18
VIII. HEAD ADJUSTMENT ................................................................... 19
I. TAPE GUIDE ADJUSTMENT .................................................... 20
2. REC/PB HEAD
AZIMUTH ADJUSTMENT .............................. 20
3. HEAD HEIGHT ADJUSTMENT ................................................ 20
4. HEAD BLOCK PROJECTION ADJUSTMENT ......................... 20
IX. ELECTRICAL ADJUSTMENT....................................................... 21
I. SYSCON P.C BOARD ADJUSTMENT ....................................... 21
2. PRE-AMP P.C BOARD ADJUSTMENT ..................................... 22
X. DC RESISTANCE OF HEAD.......................................................... 24
XI. CLASSIFICATION OF VARIOUS P.C BOARDS ......................... 24
I. P.C BOARD TITLES AND IDENTIFICATION
NUMBERS.................................................................................... 24
2. COMPOSITION OF VARIOUS P.C BOARDS ............................ 25
-------------SERVICE MANUAL HX-R5/GX-R6-------------
3

I. SPECIFICATIONS
1-1. MODEL HX-R5
Track system 4 Track 2 Channel stereo system
Tape
Philips type cassette
Heads Erase Hea'd x 1
High Density for
REC/PB x 1
Motors Electronically speed controlled
DC motor for capstan drive x 1
DC motor for cam drive x 1
Wow & Flutter 0.12% (DIN)
0.04% (W. RMS)
±0.07% W. PEAK (EIAJ)
Frequency Response NORMAL: 20 to 15,000
Hz ± 3 dB (-20 VU)
CrO2: 20 to 16,000
Hz ±3 dB (-20 VU)
METAL:
20 to 17,000 Hz ± 3 dB (-20 VU)
SIN 58 dB
55 dB (EIAJ)
DOLBY
BON: Improves up to 5 dB at 1 kHz
10 dB above 5
kHz
DOLBY CON: Improves up to 15 dB at 500 Hz
20 dB
at 1 kHz to 10 kHz
Distortion 0. 7% (MET AL)
Input LINE: 70
mV/47 kohms
MIC: 2.5
mV/5 kohms
Output
LINE: 410 mV/1 kohms
PHONE: 1.3 mW/8 ohms
Power Requirements IO0V,
50/60 Hz for Japan
120V, 60 Hz for USA and Canada
220V, 50 Hz for Europe except UK
240V, SO Hz for UK and Australia
110V/120V/220V /240V, 50/60 Hz switchable for other coun-
tries
Power Consumption JPN: 18W
CSA,AAL: 18W
UT: 18W
Dimensions 440 (W) x 105 (H) x 288 (D)
mm
(17 .3 x 4.1 x 11.3 inches)
Weight 4.7
kg(I0.3 lbs)
* For improvement purposes, specifications and design are subject to change without notice.
* Noise reduction manufactured under license from Dolby Laboratories Licensing Corporation. "Dolby" and the Dou-
ble-O symbol are trade marks of Dolby Laboratories Licensing Corporation.
----------------~ERVICE MANUAL HX-RS----------------
4

1-2. MODEL GX-R6
Track system 4 Track 2 Channel stereo system
Tape Philips type cassette
Heads Erase Head x 1
Twin Field super GX head for REC/PB x I
Motors Electronically speed controlled DC motor for capstan drive x I
DC motor for cam drive x I
Wow & Flutter 0.12% (DIN)
0.04% (W. RMS)
±0.07% W. PEAK(EIAJ)
Frequency Response NORMAL:
20to17,000Hz±3dB \-20VU)
CrO2: 20 to 18,000 Hz ± 3 dB (-20VU)
METAL:
20 to 19,000 Hz ± 3 dB (-20VU)
SIN 58 dB
55 dB (EIAJ)
DOLBY BON: Improves up to 5 dB at I kHz
IO dB above 5 kHz
DOLBY CON: Improves up to 15 dB at 500 Hz
20 dB at I kHz to 10 kHz
Distortion 0. 7% (MET AL)
Input LINE: 70
mV/47 kohms
MIC: 2.5 mV/5 kohms
Output
LINE: 410 mV/1 kohms
PHONE: 1.3
mW /8 ohms
Power Requirements I00V, 50/60 Hz for Japan
120V, 60 Hz for USA and Canada
220V, 50 Hz for Europe except UK
240V, 50Hz for UK and Australia
I
IOV/120V/220V/240V, 50/60 Hz switchable for other coun-
tries
Power Consumption JPN: 16W
CSA,AAL:
17W
UT:
17W
Dimensions
440 (W) x 105 (H) x 288 (D) mm
(17 .3 x 4.1 x 11.3 inches)
Weight 4.7
kg (I0.3 lbs)
* For improvement purposes, specifications and design are subject to change without notice.
* Noise reduction manufactured
under license from Dolby Laboratories Licensing Corporation. "Dolby" and the Dou-
ble-D symbol are trade marks of Dolby Laboratories Licensing Corporation.
----------------SERVICE MANUAL GX-R.n-----------------

II. DISMANTLING OF UNIT
In case oftrouble, etc. necessitating dismantling, please dismantle in the order shown in the photographs.
Reassemble
in reverse order.
2
3
j
; I
! l
b-,'®I
a
SCREWS
UPPER COVER
'
,,,.,.. ... .., .. ~..,.,, -- -
"' -·""""'""' ~...... ~
~'"•---•"' "'\~t;,!OCUJ,ru - ~ ~
~ - ~ ~ ,,,
.;;::: .. ~ "" -"" -·-
_JL
b
. ~o ~~ . l~I """ ··="'
SCREWS
4
S.CREWS
5 b
SCREWS
6
---------------SERVICE MANUAL HX-R5/GX-R6--------------
6

Ill. CONTROLS
Fig. 3-1 Front View
Fig. 3-2 Rear View
1. POWER SWITCH 16.
REC LEVEL CONTROL
2. CASSETTE HOLDER 17. DIGITAL COUNTER
3. EJECT BUTTON 18. IPLS INDICATOR
4. OPERATION BUTTONS 19. DOLBY B/C INDICATORS
5. CONTAINS JACKS FOR MIC L/R AND HEADPHONE
20.
MPX FILTER INDICATOR (GX-R6 ONLY)
6. OUTPUT/PHONES CONTROL (GX-R6 ONLY) 21. TAPE (NORMAL, Cr02, METAL) INDICATORS
7. TIMER START SELECTOR
22.
REC LEVEL POSITION INDICATOR
8. RESET BUTTON FOR DIGITAL COUNTER 23. REC/P.B LEVEL INDICATORS
9. IPLS BUTTON 24.
REV SELECTOR AND DIRECTION INDICATORS
10.
REV SELECTOR
25.
REMOTE CONTROL JACK
11. INTRO SCAN BUTTON (GX-R6 ONLY)
26. LINE IN (L/R) JACKS
12. BLANK SEARCH BUTTON (GX-R6 ONLY)
27.
LINE OUT (L/R) JACKS
13. DOLBY NR SWITCH AND SELECTOR
28.
VOLTAGE SELECTOR ( [Q]) model only
14. REC CANCEL BUTTON (GX-R6 ONLY) 29. AC POWER CORD
15.
MPX FILTER SWITCH (GX-R6 ONLY)
--------------SERVICE MANUAL HX-RS/GX-R6,--------------
7

IV. PRINCIPAL PARTS LOCATION
POWER
SWITCH
CAM DIRECTION
SW905
HOUSING PCB
CMROID1430
GUIDE DETECTOR PCB
CMROID0220
POWER
TRANSFORMAR
T901
POWER SWITCH
CONTROL
PCB
CMROIC189A
CAM MOTOR
RD-IBOS
REC/PB AND ___ ~
ERASE HEAD
LEAF SWITCH PCB
CMROIC1490
CAM MOTOR PULSE PCB
CMROICIB9B
TIMER START (SW19)
OFF/ PLAY/ REC
EJECT SW902
,-ouTPUTPcs7
I T2045A501C 1
Lo~T_f'_U:1:... ~Ll:l_Mi ~
GX-R6 ONLY
CAPSTAN MOTOR
EG-510ED-2B2
COUNTER RESET(SW15)
DOLBY NR
ON/OFF(SW16)
B / C (SW17)
~MPXFILTTRtSWISl]
~ ~C~C~N~E~(~w19>_j
GX-R6 ONLY
Fig. 4-1 Front View
LINE IN,OUT JACKS REMOTE JACK
Fig. 4-2 Top View
---------------SERVICEMANUALHX-RS/GX-R.b---------------
8

V. CIRCUIT OPERATION DESCRIPTION
5-1. PRE-AMP BLOCK DIAGRAM
UP ~
___________________________ o_o_w--<N 8:P,
MIC INr~------
IC I M5218L
r-- -- --,
I re 11 I
3 MIC/LINE
~-~
I I ELECTRONIC I I
2 AMP VOLUME
SW
IN MIC JACK
IC4 LC7530
L ________ ...J
SYSCON PCB
LINE OUT~---+-----------..--------'
METER OUT
(TO SYSCON)
TR3 2SC2320
(
I
I
/
/
I /
~/
PB
MUTE
TR26to28
PB
AMP
I RL I
I .--....;... __ _
L_____ REC/PBS
RELAY
TR26
2SCl843
TR27 2SCl312S
TR28 2SC2320
TR29 2SC2603
!5
9
IC3 NE654
DOLBY
SWITCHING
IC
IC2 NE652
DOLBY
IC
IC5
LA6458S
IPLS
AMP
TR22,23 2SC2603
BIAS
osc
C77
,
REC LEVEL
IC4 LA6458S---(GX-R6)
TR? 2SC2320---(HX-R5)
TR8tol3 2SC2320
REC
AMP
TR6 2S01012
REC
MUTE
BIAS TRAP
REC MUTE
P. B MUTE
DOLBY SW
OFF/B/C
IPLS OUT
REC/PB SW
L..-----------------{
1
OSC ON/OFF
Cr02 BIAS
METAL DET
Fig. 5-1 Block Diagram of Pre-Amp P.C Board
z
0
u
en
>-
en
0
I-
-------------------------------SERVICEMANUALHX-R5/GX-R6;-------------------------------
9

5-2. SYSCON BLOCK DIAGRAM AND THE PERIPHERAL CIRCUIT
INPUT EXPANDER +5V
SW902 EJECT
SW5 STOP
SW I FWD
SW2
REV
SW6 REC
SW3
FF
SW4 REW
SW?
AUTO MUTE
,-----------,
1SWIO REC CANCEL!
TIMER
PCB
1
sw12 INTRO SCAN:
(GX-R6 ONLY)
~ ~WJ !_ _B~S ___ --~
SW 13 REV SELECTORc >------iM
SWl4 IPLS
SW 15 COUNTER RESETu---------___.
SW905
SW901
INPUT
EXPANDER
CAM DIRECTION u-----;,.i
FWD/REV
SW906
LEAF SW PCB
[
SW903
ANTI REC (RWD)u------;;,"ls
ANTI REC (REV)C>------eM
SW904
SW907
METER PCB SWl9
Cr02
METAL
[
REC
TIMER PLAY
TR2,3
POWER
SUPPLY
PH2
CAM MOTOR
PULSE
PCB
TRI, IC9
POWER OFF
DETECT
*IC2 LB1290
.--..,.....-~-~-~ FLO
DRIVER
G5
64
- - - ...l..
I I I I LI t/ g /b
* IC3,4 LBl290
FLO
I I I I C.I •Qc
DRIVER
FLO (IN I)
MUSIC
INTERVAL
DET
TR22,23, IC5
ON PRE AMP
* IC2,3,4 ARE LOCATED ON
METER PCB
TPI
QUICK REV IE----1
DET GUIDE
DET
PCB
TRIOtol3 TR901,D901
IC I
"'
N
~
2
0
"'
IL
I-
:::,
IL
~
~
0
I-
:::,
IL
I-
:::,
0
!::
(!)
0
IIJ
>
"'
0
I-
z
IIJ
2
(!)
IIJ
(I)
XI (O.BMHzl
CERAMIC
osc
LM-6402H-190
EX TAL
+5V
PRE AMP PCB
REC/PB SW
:>o-+-----------H--ir REC/PB sw 7
L....~~TR~ __J
OSC CONTROL 9
l}----t------t------------t-+tr osccoNTROL 7
L - ...:!:_R2_~ _ __J
PB MUTE
r-PBMUTE-
7
x:~-----------------1....- TR3 I
L _____ ...J
REC MUTE 7
'REC MUTE--,
:>o--+------------f~ TR6 I
CAM MODE
STOP DET INPUT
TR902
DETECTOR (AHBl
PCB
L _____ ...J
CAM DIRECTION
DET INPUT
,IE--------P_H---1
3
CAM DIRECTION
REEL ROTATION
PULSE INPUT
EXT CONTROL
OUTPUT
NORMAL
2
Cr02 31
METAL
I-
:::,
IL
FWD
I-
:::,
0
>-
C[
...I
IL
REV
(I)
0
z
0
.:::
C[
"'
IIJ
IL
0
IPLS
IC?
CAM MOTOR
CONTROL
REVERSE~~--~
IC5 BA6109
PCB
FLO
!IN ll
.r-t- ➔ -tONCE REV
r--1-- ➔ --tCONTI REV
~~RR~~Lj
Cr02
!TR6l
METAL
(TR? l
IC6 LBl290
IC7,8 LC4049B
CAM MOTOR
M901
PRE
AMP PCB
Fig. 5-2 Block Diagram ofSyscon P.C Board
--------------------------------------SERVICEMANUALHX-RS/GX-R.o---------------------------------------
10

5-3. ELECTRONIC VOLUME
LB 1290
LC7530
...J
w
>
w
...J
l)
w
DOWN 11
Ct:
Cs
SIG I
Model HX-R5, GX-R6 employs Electronic Volume in-
stead of Mechanical REC Volume,
and uses an IC
(LC7530) for both channels.
05
UP -
~
u
02;:l
,
TR9
L INPUT
L OUTPUT
R41
+14V
Fig. 5-3
---------------SERVICEMANUALHX-RS/GX-R.o---------------
11

Pin No. Symbol Description
I INDI
Attenuation
IND
1 REC Level Indicator Drive Terminal Step 8 7 6 5 4 3 2 I
8 IND8
0 -
I H
--
2 H H
-
3 H
-
f--
4 H H
--
5 H
-
f------
6 H H
-
~
7 H
--
8 H H
--
9 H
--
10 H H
--
II H
--
12
H H
-
f--
13
H
~
-
14 H H
f------
-
15 H
9 SIG2 RCH Signal Input Terminal.
IO COM2 RCHSignal Output Terminal.
Attenuation Attenuation
13 COMI LCH Signal Output Terminal. Step (dB)
14
SIGI LCH Signal Input Terminal. 0 0
A-sw1,
I
-1.0
SIG-
--_
COM
2
-2.0
~;,
3
-3.4
A-SW14 4 -5.1
~ 0--
5 -7.1
I 6 -9.3
I 7
-11.7
I 8 -14.1
I 9
-16.5
.,, :d
10
-18.8
tl
1
11
-21.1
12
-24.5
13 -28.8
14 -34.0
-' A-SWO
15
-80.0
VM ~
This attenuator shown above is made up of diffused resistors R (50 kohms) and analogue
switches (SW0
~ 15), and it attenuates 0 dB to 80 dB in 16 steps (step Oto 15).
11
Vss
Center Bias Terminal.
Connected to the ground
of signal line.
12
VEE
Connected to ground.
15
cs Back-up Control Terminal. Back-up mode
at "L".
--
16 INT
Attenuator (step 9) Set Up Terminal, active at "L".
17 DOWN
Attenuator Control Signal Input Terminal.
(Increases attenuation)
-
18 UP Attenuator Control Signal Input Terminal.
(Decreases attenuation)
DOWN ...... Becoming "L" level at this terminal activates the internal oscillator, and
Attenuation
is increased one step each time at the rising edge of oscillation wave.
Keeping this terminal at
"L" level continues attenuation rise until the attenuation rise and
oscillation stop
at the sixteenth step. (Attenuation of80 dB)
-
UP ...... Attenuation decreases in the same manner as above.
19 CR Capacitor and Resistor Terminal for Internal Clock Oscillator.
20
Yoo
Power Supply Terminal (+20V).
Chart I
----------------SERVICE MANUAL HX-R5/GX-R6---------------
l2

VI. MECHANICAL DESCRIPTION PART FOR EACH MODE
6-1. DESCRIPTION OF THE MECHANISM DRIVEN BY CAM WHEELS (L) & (R)
CAM MOTOR
PULLEY CAM SLIT
PHOTO SENSOR A ( PH2)
PHOTO SENSOR B (PH3)
0
' /
-r
I
CAM WHEEL (L)
LED (D9O2)
(Located on DETECTOR (Bl PCB
FAN- SHAPED HOLE
~ -- ~',
,' \
/) '
0 J
-'r-il ,'
-/
~--
CAM WHEEL (R)
SW LEAF MODE
(CAM DIRECTION SW SW9O5)
Fig. 6-1 Cam Wheels (L) & (R) Drive Mechanism (Front View)
Cam Motor Pulse Input
(IC I pin (6))
Cam Direction Detection Input
(IC I pin (3j )
6-1-1. The sequence of this transmission is as follows.
(Refer to Fig. 6-1)
CAM MOTOR .... BELT CAM .... PULLEY CAM SLIT
.... CAM WHEEL (L) .... CAM WHEEL (R)
6-1-2. CAM MOTOR is driven by IC5 (BA6109) on
SYSCON PCB and this IC5 is controlled by the various
control signals from various detectors and switches
through the action of Ml-COM IC! (LM6402H-l 90).
6-1-3. PULLEY CAM SLIT is driven by BELT CAM
and drives CAM WHEEL (L), and the slits on PULLEY
CAM SLIT are used for the detection of CAM MOTOR
PULSE and CAM DIRECTION.
6-1-4. CAM WHEELS (L) (R) contain grooves to shift 8
mechanical parts shown in Figs. 6-5 & 6-6, which exe-
cute all the operations such as;
I) Shifting Head block up and down.
2) Shifting
Pinch Rollers up and down.
3) Rotation of Reel Tables.
4)
Rotation of Head (for FWD & REV modes)
H H
IL
:L
I I
I
IH
I I
I I
I I
I
1L
I I
I I I
+I +I
-1 -1
-,
UP UP DOWN DOWN DOWN
Fig. 6-2
6-1-5. SW LEAF MODE is used for the detection of the
current CAM WHEEL position. It is "ON" during
REV /FF modes and "OFF" during FWD/REW modes .
6-1-6. DETECTORS A, Bare usd for the detection of
STOP mode. TR902 is "ON" during STOP mode.
6-1-7. PHOTO-SENSOR A (PH2) is used for the detec-
tion
of CAM MOTOR PULSES, and tog~ther with
PHOTO-SENSOR B, its count sets up the position of the
CAM WHEELS.
6-1-8. PHOTO SENSOR B (PH3) is used for the detec-
tion of CAM direction. That part of the CAM MOTOR
PULSE in which the pulse changes from "H" to "L" is
used for counting up (+) and down(-) as indicated in Fig.
6-2
to set up CAM WHEELS (L) & (R).
---------------SERVICE MANUAL HX-RS/GX-Rn----------------
13

6-1-9. Mechanical Operations in each mode
LEVER BRAKE (L)
IDLER PLAY ASSY(L)
ARM RETURN(L) -----~
ARM PLAY PART (L)--~
ARM HEAD SHIFT (L) _____J
SLIDE FF---+----:s,..,.
RACK
LEVER BRAKE (R)
PLAY (R)
IOLER PLAY ASSY (R)
++-~+-+----RUBBER PULLEY
~K=7:--r
1
---CAPSTAN
~-- ARM PLAY PART (R)
L__ ARM HEAD SHIFT (R)
Fig. 6-3 The Mechanism for FWD/REV Mode
.----------------,---- ARM WIND ASSY
'-~
---t----- GEAR WIND (8)
~~.J1
..-
1
~---SLIDE RWD
ltr :""" -;,7.J I
l, {1 V. ,..J
P4
~~ ,~=-,...~ ~-
ARM IDLER SHIFT(L)---+---
,-,
Fig. 6-4 The Mechanism for FF/RWD (includes IPLS & Intro Scan)
---------------SERVICE MANUAL HX-R5/GX-R6,---------------
14

ARM HEAD SHIFT (R) -----------~ ~-----------ARM HEAD SHIFT (L)
ARM IDLER SHIFT (R)---t+-------Sa>I
HOUSING ROTARY PART
GEAR HEAD
RACK TORSION SPRING ,
HEAD CHASSIS PART
Fig. 6-5 The Location of Arm Head Shift & Arm Play (Inside View)
SET CAM WHEELS (L) a (R)
AS SHOWN IN THIS CIRCLE 1-E----+t------ARM IDLER SHIFT(L)
Fig. 6-6 The Location of Arm Idler Shift & Arm Return (Inside View)
HOLDER ROTARY
rGEAR HEAD
\ RACK
~ ' I
□~)
Fig. 6-7 The Bottom View of Rotary Head Mechanism (FWD Mode)
---------------.°'ERVICEMANUALHX-RS/GX-Ro---------------
15

I) FWD mode (Refer to Fig. 6-3)
Cam Wheels
(L) & (R) turn clockwise (L) and
counter-clockwise (R) for
+91 counts in each direc-
tion, and put
on the brake for 20m sec. (All the
other modes end with the brake operating for 20m
sec as well.)
The mechanical operations in the meantime are as
follows.
a) Arm Return (L) moves to the right and pushes
· Rack in the same direction so that the Rota-
ry head turns into the FWD position.
b) Arm Head Shift (L) turns on its pivot ®
so
Part ® moves downwards and Part @ moves
upwards. (Part
®)[pushes Head Chassis up to
the position for play mode.
pushes Lever Brake (Part
©) up and release the
brake.
c) Arm Play (R) turns on its pivot (§ so Part @
moves to the right, and Part ® moves down-
wards and pushes Slide Play (R) down so that
Idler Play Assy (R) moves to the left and trans-
mits the rotation
of the Capstan to the Take-up
Reel Table.
At the same time,
Arm Pinch Roller (R) turns
clockwise on its Pivot ®) and Pinch Roller (R)
comes up for Play mode.
2) REV mode (Refer to Fig. 6-3)
Cam Wheels (L) & (R) turn counter-clockwise (L)
and clockwise (R) for the same counts as FWD
mode.
The mechanical operations in REV mode can be
obtained from the description
of FWD mode in
item I) by interchanging left
(L) and right (R).
3) FF mode (Refer to Fig. 6-4)
a) Cam Wheels
(L) & (R) turn counter-clockwise
(L) and clockwise (R) for 43 counts and turn the
other way (clockwise (L), counter-clockwise (R))
until the count is reduced to 25.
b) In
FF & RWD modes, only Arm Idler Shift (L),
(R) are involved.
Arm Idler Shift
(L) turns on its pivot (§) so Part
® moves to the right which pushes the Slide FF
to the right --~ Arm Wind Assy moves to
the right, engages Gear
Wind
(B) and transmits the
rotation
of Arm Wind
Assy to Take-up Reel
Table.
,__ ___ Pushes Lever Brake (R)
(Part @ ) to release the
brake.
4) RWD mode (Refer to Fig. 6-4)
a)
Cam Wheels (L) & (R) turn clockwise (L) and
counter-clockwise (R) for the same counts as
FF
mode.
b)
The mechanical operations in RWD mode can
be obtained from the description
of the FF
mode in item 1) by interchanging left (L) and
right (R).
5) FF Search (IPLS, Intro Scan)
a)
Cam Wheels turn in the same directions as in
FF mode for 51 counts and for the reduction of
25 counts.
b)
The mechanical operations in this mode are the
same as in
FF mode, except that the Arm Head
Shift
(L) pushes up the Chassis Head Part which
raises the Head Block to the
FF Search mode
position.
6) RWD Search (IPLS, Intro Scan)
a) Cam Wheels
turn in the same directions as in
RWD mode for the same counts as in
FF search
mode.
b) The mechanical operations in this mode are the
same as in
REW mode, except that the Arm
Head Shift (R) pushes up the Chassis Head Part
which raises the Head Block to the R WD Search
mode position.
6-1-10. How to install Cam Wheels (L) and (R). (Refer
to Fig. 6-6)
Set
Cam Wheels (L) and (R) as indicated in Fig. 6-6.
The color
of Cam Wheel (L) is black and (R) is white,
and they rotate around the fulcrum provided by the Cap-
stan Holder Part on the Chassis Mech Part.
6-1-11. The bottom view of Rotary head mechanism.
Refer to
Fig. 6- 7 when the assembly of this mechanism
1s necessary.
6-1-12. The relation between each mode and five me-
chanical parts.
Refer to Chart
2.
---------------SERVICE MANUAL HX-RS/GX-Ro---------------
16

~
FWD REV FF RWD
FF SEARCH RWDSEARCH
(]PLS, INTRO (IPLS, INTRO
s SCAN) SCAN)
(L) 0 X X X 0 X
ARM HEAD SHIFT
(R) X 0 X X X 0
(L)
X 0 X X X X
ARM PLAY
(R) 0 X X X X X
(L) 0 X X X X X
ARM RETURN
(R) X 0 X X X X
(L)
X X 0 X 0 X
ARM IDLER SHIFT
(R) X X X 0 X 0
(L)
f'}
r n n n n
+91 -91
-43 -25
+25 +43
-51 -25
+25 +51
CAM WHEEL
(R) r
~
n n n n
Chart 2
0 Related (Involved),
x
Not Related (There might be some movements but not related to any operations).
'J, Rotation Direction Clockwise for +91 counts.
0 Counter-clockwise for -91 counts.
-91
n :Clockwise for +43 counts and Counter-clockwise to +25 counts.
+25 +43
() : Counter-clockwise for -51 counts and Clockwise to -25 counts.
-51 -25
* All the mode conditions are indicated relative to the Stop mode.
---------------SERVICEMANUALHX-R5/GX-R6---------------
17

VII. MECHANICAL ADJUSTMENT
7-1. PINCH ROLLER PRESSURE
MEASUREMENT (Refer
to Fig. 7-1)
270 to 370 grm
REV
PINCH
ROLLER--+----+-~
PINCH ROLLER SHAFT
Put in FWD PLAY Mode. Push pinch roller shaft down
with the spring gauge, and push the pinch roller I to 2
mm away from the capstan and release slowly.
Read the spring gauge at the moment the pinch roller
7-2. WINDING TORQUE MEASUREMENT
IN EACH MODE (Refer
to Fig. 7-2)
CASSETTE TORQUE METER
Fig. 7-2
Insert a cassette torque meter (AJ-751179) and measure
in each mode.
For Fast Forward and Rewind, measure
at the end of the
tape when the tape has stopped running.
Forward
or Reverse mode
Take up Torque: 25 to 45 g-cm
Back Tension Torque: 2 to 5 g-cm
Fast Forward
or Rewind mode
Take up Torque: 70 to 150 g-cm
FWD
,----,--,----PINCH ROLLER
FWD
PINCH ROLLER
SPRING
PINCH ROLLER SHAFT
Fig. 7-1
touches the capstan and begins to rotate. Specified con-
tact pressure measurement
is 270 to 370 grams.
If the correct measurement is not obtained, replace the
pinch roller spring. Do the same for the reverse side.
7-3. TAPE SPEED ADJUSTMENT
(Refer
to Fig. 7-3)
CAPSTAN MOTOR
Fig. 7-3 Location of Tape Speed Adjustment
Variable Resistor
Connect a frequency counter to Line Output terminal.
Playback a 1,000 Hz pre-recorded Test
Tape
(AT-750744), or 3,150 Hz pre-recorded Test Tape
(AT-751263), and adjust the Tape Speed Adjustment
Variable Resistor
(See Fig. 7-3) to obtain a tape speed of
1002 ±3 Hz, or 3155 ± IO Hz.
---------------SERVICE MANUAL HX-RS/GX-Ro---------------
18